He was ______strict man and he was strict with his work. When he was 36, he was elected
地球上氦元素主要以3He形式存在，而月球土壤中吸附着数百万吨3He..[98%]
地球上氦元素主要以3He形式存在，而月球土壤中吸附着数百万吨3He，据估算3He核聚变所释放的能量可供人类使用上万年。下列关于3He和4He的说法正确的...
He was ______strict man and he was strict with his work. When he was 36, he was[98%]
He was ______strict man and he was strict with his work. When he was 36, he was elected ______chairma
下列关于32He的说法正确的是[]A．32He原子核内含有2个中子B．32He原..[98%]
下列关于32He 的说法正确的是[ ]A．32He 原子核内含有2 个中子 B．32He 原子核内含有3 个质子C．32He 原子核外有3 个电子 D．32He 和42He 是两种不同的核素
3He可以作为核聚变材料．下列关于3He的叙述正确的是（）A．3He和3H互..[98%]
3He可以作为核聚变材料．下列关于3He的叙述正确的是（ ）A．3He和3H互为同位素B．3He原子核内质子数为3C．3He原子核内中子数为1D．3He原子易失去两个...
When he got the train, he didn’t know where he[98%]
When he got the train, he didn’t know where he was.
Seldom ______so warmly welcomed. A. has he been B. he has been C. was he D. he h[98%]
Seldom ______so warmly welcomed. A. has he been B. he has been C. was he D. he h
...our e-friend Wang Bing: He′ s Peter. He lives in the UK. Liu Tao: How old is he Wang Bing: He is...[98%]
Liu Tao: Who is your e-friend 
Wang Bing: He′ s Peter. He lives in the UK. 
Liu Tao: How old is he 
Wang Bing: He is 11 years old. 
Liu Tao: Can he speak Chinese 
Wang Bing: Y...
Yukio is new. He is from 1 . He is fifteen. He is a nice..[98%]
Yukio is new. He is from 1 . He is fifteen. He is a nice 2. He has yellow skin. He has a 3 face with big eyes, a small nose and a small mouth. He is tall. He has 4 legs. 5 hair is black and short. We&...
On the way to the airport, the driver told me()A.he is lostB.he was lostC.he lostD.he l[98%]
On the way to the airport, the driver told me()A.he is lostB.he was lostC.he lostD.he l
